Problem with rss feed created in php

I have created a php base rss feed , but the feed getting error "XML Parsing Error: not well-formed"

I notice that if there are special characters like & , < , > , ', " and others the problem is showing but if no special characters there is no error.

Here is my sample code :

<?php
$data ="<item>
                          <title>title of feed</title>
                          <link>link of feed</link>
                          <description>description</description>
			  </item>";

header("Content-type: application/xml; charset=ISO-8859-1");
echo '<?xml version="1.0" encoding = "UTF-8" ' ."?>\n";
?>

<rss version="2.0">
<channel>
<title>Title here</title>
<link>site url</link>
<description>description here</description>
<?=$data?>
</channel>

Code (markup):

 

Where are these characters? In tags or or Tag data?

Try using this

$data ="<item>
<title>".htmlspecialchars("title of feed")."</title>
and so on....

 

A useful function I use for converting special characters when creating XML files. Courtesy of user comments on php.net:

function xmlentities($string, $quote_style=ENT_QUOTES)
{
    static $trans;
    if (!isset($trans)) {
        $trans = get_html_translation_table(HTML_ENTITIES, $quote_style);
        foreach ($trans as $key => $value)
            $trans[$key] = '&#'.ord($key).';';
        // dont translate the '&' in case it is part of &xxx;
        $trans[chr(38)] = '&';
    }
    // after the initial translation, _do_ map standalone '&' into '& #38;'
    return preg_replace("/&(?![A-Za-z]{0,4}\w{2,3};|#[0-9]{2,3};)/","& #38;" , strtr($string, $trans));
}

PHP:

EDIT: vB's parser won't let me post &#38; without converting to &. Just remove the space from the return value in the preg_replace line.